Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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begin
Description

Returns the result type of begin.

Synopsis
template<typename Seq>
struct begin
{
    typedef unspecified type;
};

Table1.19.Parameters

Parameter

Requirement

Description

Seq

A model of Forward Sequence

Argument sequence

Expression Semantics
result_of::begin<Seq>::type

Return type: An iterator modelling the same traversal concept as Seq.

Semantics: Returns the type of an iterator to the first element of Seq.

/sequence/intrinsic/begin.hpp>

Example
typedef vector<int> vec;
typedef result_of::begin<vec>::type it;
BOOST_MPL_ASSERT((boost::is_same<result_of::deref<it>::type, int&>))

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